<?php
 function qq_status($qq){
    $url = 'http://wpa.qq.com/pa?p=2:'.$qq.':52';
    $Headers = get_headers($url, 1);
    if ($Headers['Location']=='http://pub.idqqimg.com/qconn/wpa/button/button_121.gif'){
        $Status = 1;  //QQ在线
    }elseif ($Headers['Location']=='http://pub.idqqimg.com/qconn/wpa/button/button_120.gif'){
        $Status = 2;  //QQ离线
    }else {
        $Status = 0;  //未知
    }
    return $Status;
 }

 $status_code = qq_status($_GET['qqNumber']);
 header("Content-type:text/html; Charset=UTF-8");
 if( $status_code == 1){
    exit(json_encode(['status' => true]));
 }else{
    exit(json_encode(['status' => false]));
 }
?>